The price of multifamily homes and apartment buildings fell in New York, Los Angeles, and San Francisco in the third quarter, Property Research Partners LLC, a Brooklyn, N.Y., data seller that does business as PropertyShark, said Thursday.

The median price dropped 9% in New York, to $590,000, 35% in Los Angeles County, to $435,000, and 5% in San Francisco, to $859,000, according to PropertyShark, which tracked sales of residential or mixed-use buildings with two units or more in the three places.

"It looks to me that everything is coming down," said Bill Staniford, PropertyShark's chief executive officer. "You have a potential bottom in L.A., but San Francisco and New York continue to drop. Transactions are frozen in New York, and inventory is building up."

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